function loginSys(){
    var username = $("#username").val();
    var password = $("#passWord").val();
    if(username == ""){
        $('#username_error').show();
        $('#password_error').hide();
        $('#login_error').hide();
        return;
    }if(password == ""){
        $('#username_error').hide();
        $('#password_error').show();
        $('#login_error').hide();
        return;
    }else{
        var result = validate(username,password);
        if(result == true){
            window.location.href = "../comentList.html";
        }else{
            $('#username_error').hide();
            $('#password_error').hide();
            $('#login_error').show();
        }
    }
}
function validate(username,password){
      return false;
}